Numerical Study on the Viscosity of Shocked Al vis Small-Perturbation Amplitude Damping Profile Measurement by Flyer Impact

Flyer-impact disturbance amplitude damping method of shock wave is one of practical method for viscosity measurement at high pressure and high temperature. The experimental results for shocked Al at two high pressures have been reported previously by Li, et al, instead of the analytical solution method, which was proposed by Miller and Ahrens, for treating same characteristic data from the measured profiles that was adopted in Li's analysis. Here we first put forward a two-dimensional Eulerian viscous fluid, to make a full-shock front perturbation evolution simulation. The measured profile at 78 GPa is used as an example in our re-analysis. The numerical simulated profile agrees well with the measured one, from which the determined effective viscosity coefficient of the shocked Al at 78 GPa is (2.80.1)kPas. This value is about twice of the Li's one ((1.30.3)kPas), but we believe the value in the present study might be more reasonable because it is obtained from a comprehensive simulation for the full-shocked perturbation evolving process.